ATmega128(L) Complete Datasheet (Atmel, 2011)
The supplied 386-page primary manual for the original ATmega128 and ATmega128L. It is valuable for historical-device firmware and for exposing larger-AVR mechanisms such as extended addressing and external memory, but current ATmega128A claims are checked against Microchip's ATmega128A manual.
This 386-page device manual is the second admissible primary source supplied in PMPS-2. It expands the same AVR architectural family into a device with more flash and SRAM, multiple serial channels and timers, an external memory interface, JTAG, and bootloader facilities.
What it adds beyond the smaller device #
The most reusable contribution is not a longer peripheral list. It shows where a nominally 8-bit architecture grows additional address state: RAMPZ extends program-memory access, larger program counters affect call/return state, and external data memory introduces timing and bus-interface concerns. Those details prevent the false assumption that every AVR binary, pointer, stack frame, or boot routine scales unchanged with flash size.
It also provides richer examples of shared-pin multiplexing, multiple interrupt sources, dual USARTs, 16-bit timer capture/compare, synchronous serial operation, JTAG boundary scan and on-chip debugging, and boot-section protection.
Current-use boundary #
- Use the manual for the original ATmega128/L only. ATmega128A has its own current data sheet and errata.
- Register names can be similar across AVR devices without identical reset values, interrupt vectors, pin routes, or write sequences.
- External-memory timing and electrical limits are package-, voltage-, frequency-, and revision-specific.
- JTAG, bootloader, fuse, lock-bit, and programming operations are state-changing device contracts; the exact current manual must be followed.
Visual audit #
All 386 pages were rendered and inspected. The essential visuals are the core and full-device block diagrams, memory maps and external-memory timing, clock/reset tree, pin-function tables, interrupt vectors, timer/PWM paths and waveforms, serial interface timing, ADC/comparator routing, boot flash partitions, JTAG chain, programming connections, and electrical graphs.
GTK synthesizes these into generic contract diagrams and an AVR memory model. No data-sheet figure is copied into the entries, and no ATmega128-specific register map is presented as a cross-device template.